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Related Concept Videos

Autism Spectrum Disorder01:19

Autism Spectrum Disorder

Autism spectrum disorder (ASD) is a neurodevelopmental condition marked by persistent deficits in social communication and interaction alongside restrictive and repetitive behaviors or interests. ASD is sometimes accompanied by intellectual impairment.
These core symptoms manifest differently among individuals, ranging from mild to severe. The disorder's complexity extends beyond its clinical presentation, encompassing a diverse range of biological, cognitive, and sociocultural influences.
Olfaction01:25

Olfaction

The sense of smell is achieved through the activities of the olfactory system. It starts when an airborne odorant enters the nasal cavity and reaches olfactory epithelium (OE). The OE is protected by a thin layer of mucus, which also serves the purpose of dissolving more complex compounds into simpler chemical odorants. The size of the OE and the density of sensory neurons varies among species; in humans, the OE is only about 9-10 cm2.
The olfactory receptors are embedded in the cilia of the...
Olfactory Receptors: Location and Structure01:03

Olfactory Receptors: Location and Structure

The process of olfaction, also known as the sense of smell, is a sophisticated chemical response system. The specialized sensory neurons that facilitate this process, known as olfactory receptor neurons, are situated in an upper segment of the nasal cavity, known as the olfactory epithelium. Olfactory sensory neurons are bipolar, with their dendrites extending from the epithelium's apex into the mucus that lines the nasal cavity. Airborne molecules, when inhaled, traverse the olfactory...
Physiology of Smell and Olfactory Pathway01:20

Physiology of Smell and Olfactory Pathway

Humans detect odors with the help of specialized cells located in the upper part of the nasal cavity, called olfactory receptor neurons (ORNs). ORNs possess hair-like structures called cilia, which are receptive to sensations from the inhaled air. When an odorant molecule binds to a specific receptor on the cell of the cilia, it leads to a series of events that ultimately cause the ORN to send electrical signals to the olfactory bulb in the brain through the olfactory nerves.
The olfactory...
Modeling in Therapy01:26

Modeling in Therapy

Modeling, a key technique in therapy, uses observational learning to help clients acquire and practice new skills by watching therapists demonstrate desired behaviors. This approach, rooted in Albert Bandura's concept of vicarious learning, plays a significant role in therapeutic interventions for various psychological conditions, including social anxiety, ADHD, and depression.
Participant Modeling
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Related Experiment Video

Updated: May 9, 2026

Testing Sensory and Multisensory Function in Children with Autism Spectrum Disorder
09:13

Testing Sensory and Multisensory Function in Children with Autism Spectrum Disorder

Published on: April 22, 2015

Olfaction in the autism spectrum.

Sara A Galle1, Valérie Courchesne, Laurent Mottron

  • 1Centre d'Excellence en Troubles Envahissants du Développement de I'Université de Montréal (CETEDUM), Montréal, QC, Canada.

Perception
|July 11, 2013
PubMed
Summary
This summary is machine-generated.

Autism spectrum (AS) perception is enhanced in vision and audition, but olfaction shows impaired identification in autistic individuals, not enhanced. This suggests unique olfactory processing in autism spectrum disorder (ASD).

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Area of Science:

  • Neuroscience
  • Psychology
  • Sensory Perception

Background:

  • The autism spectrum (AS) is characterized by enhanced perceptual functioning (EPF) in vision and audition.
  • The EPF model predicts enhanced abilities in low-level (discrimination) and high-level (identification) sensory processing.
  • This study investigates whether the EPF model extends to olfactory perception in individuals with autism spectrum disorder (ASD).

Purpose of the Study:

  • To test the Enhanced Perceptual Functioning (EPF) model in olfaction for individuals with autism spectrum disorder (ASD).
  • To assess olfactory identification, detection thresholds, and discrimination in autistic, Asperger, and typically developing individuals.

Main Methods:

  • Experiment 1: Assessed olfactory identification in 9 Asperger, 10 autistic, and 11 typically developed participants.
  • Experiment 2: Evaluated odour detection thresholds and discrimination in 5 Asperger, 5 autistic, and 5 typically developed males.
  • Participants included individuals diagnosed with autism and Asperger syndrome, alongside a control group.

Main Results:

  • Olfactory identification was significantly impaired in autistic participants compared to Asperger and control groups.
  • Participants with autism spectrum disorder performed typically in low-level olfactory processing (detection and discrimination).
  • Impaired olfactory identification was specifically linked to autistic participants with a history of speech delay.

Conclusions:

  • The Enhanced Perceptual Functioning (EPF) model does not appear to apply to olfactory perception in autism spectrum disorder (ASD).
  • Unlike other sensory modalities, olfaction in ASD does not show enhanced perception; instead, higher-order processing may be impaired.
  • Reduced olfactory identification in some autistic individuals may relate to difficulties with verbal labeling, potentially due to atypical neural pathways not involving obligatory thalamic relays.